"Portage Trails: Keys to the Continent" is a fascinating book by the famous author Archer Butler Halbert, which tells about the importance of portages that connected the great trade routes in the United States. The author explores the role of these paths in the formation of the country's history, revealing to the reader new depths of information about the American expansion and the relationship with the local aborigines. With a lively writing style and detailed descriptions of many historical events, the book "Portage Trails: Keys to the Continent" is interesting for both lovers of history and mysteries of the past.